p-Hydroxyphenylacetylglycine is derived from the metabolism of L-DOPA (D533751), a dopamine precursor that induces dyskinesia in Parkinson’s disease patients. p-Hydroxyphenylacetylglycine is also used as a reagent to synthesize novel piperazine salts that have antimicrobial activity against Escherichia coli and Bacillus subtilis.